Three-raceway rotary joint

Abstract

The utility model relates to the technical field of normal temperature medium loading arm connecting pieces, in particular to a three-raceway rotary joint which comprises a rotary joint flange, an outer ring is fixedly assembled on the right side wall of the rotary joint flange through screws, and an inner ring is movably inserted into the outer ring. According to the three-raceway rotary joint, the design of three steel ball raceways is adopted, so that the load distribution of the rotary joint is more uniform; the lining ring is arranged in the steel ball raceway for clamping, so that the inner wall of the raceway cannot be abraded, and the durability is improved; by adopting the lining ring design, the friction force of the steel balls under long-time and large-load conditions can be reduced, and the operation flexibility of the crane pipe is kept.

Description

Technical Field

[0001] The utility model relates to the technical field of normal temperature medium loading arm connecting pieces, in particular to a three-roller rotary joint. Background Art

[0002] Fluid loading arm is an industrial product developed in China in recent years, mainly used for loading normal temperature fluid in petrochemical industry. Normal temperature swivel joint is the main component of fluid loading arm, and the swivel joint widely used in the industry is double raceway. However, if the inner arm, outer arm and vertical pipe are very long, the bending moment of the swivel joint will be too large during the actual operation of the crane, and the main seal will fail prematurely due to long-term operation. The raceway will also be severely worn, resulting in excessive internal friction of the swivel joint, and the crane cannot be operated. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the rotary joint currently used for the crane pipe is prone to premature failure of the main seal and wear of the raceway due to long-term operation, resulting in excessive friction inside the rotary joint and the crane pipe being unable to operate.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a three-raceway rotary joint, including a rotary joint flange, an outer ring is fixedly assembled on the right side wall of the rotary joint flange by screws, an inner ring is movably inserted inside the outer ring, three mutually corresponding annular grooves are opened on the inner arc-shaped assembly surface of the outer ring and the outer arc-shaped assembly surface of the inner ring, the annular grooves on the inner side surface of the outer ring and the annular grooves on the outer side surface of the inner ring are spliced ​​with each other to form three mutually parallel raceways, steel balls are arranged inside the raceways, an outer inner screw hole connected to the inside of the annular groove is opened inside the outer ring, and a screw plug is installed inside the outer inner screw hole.

[0005] An outer ring bushing is installed inside the annular groove on the outer ring, and an inner ring bushing is installed inside the annular groove on the inner ring.

[0006] The inner arc-shaped assembly surface of the outer ring is located outside the annular groove and is provided with a first installation groove, and a first dustproof ring is installed inside the first installation groove.

[0007] The outer arc-shaped assembly surface of the inner ring is located inside the annular groove and is provided with a second installation groove, and a second dustproof ring is installed inside the second installation groove.

[0008] A main sealing ring is arranged inside the rotary joint flange between the outer ring and the inner ring connecting end.

[0009] The outer ring bushing and the inner ring bushing are both provided with cutouts for easy loading and unloading.

[0010] The beneficial effects of the utility model are:

[0011] (1) A three-roller rotary joint of the utility model adopts a three-ball roller design, so that the load distribution of the rotary joint is more uniform;

[0012] (2) The lining ring is set inside the steel ball raceway to prevent wear on the inner wall of the raceway and improve durability;

[0013] (3) The bushing design can reduce the friction of the steel ball under long-term and high-load conditions, maintaining the flexibility of the crane operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the internal structure of the utility model.

[0017] Figure 3 It is a schematic diagram of the structure of the inner ring bushing in the utility model.

[0018] Figure 4 It is a structural schematic diagram of the outer ring bushing in the utility model. DETAILED DESCRIPTION

[0019] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0020] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Figure 1 , Figure 2 , Figure 3 and Figure 4A three-raceway rotary joint shown in the figure comprises a rotary joint flange 1, an outer ring 2 is fixedly assembled on the right side wall of the rotary joint flange 1 by screws, an inner ring 3 is movably inserted inside the outer ring 2, three corresponding annular grooves are provided on the inner arc-shaped assembly surface of the outer ring 2 and the outer arc-shaped assembly surface of the inner ring 3, the annular grooves on the inner side surface of the outer ring 2 and the annular grooves on the outer side surface of the inner ring are spliced ​​together to form three parallel raceways 4, a steel ball 5 is arranged inside the raceway 4, an outer inner screw hole connected to the inside of the annular groove is provided inside the outer ring 2, and a screw plug 6 is assembled inside the outer inner screw hole.

[0022] In order to reduce internal friction, an outer ring bushing 7 is installed inside the annular groove on the outer ring 2 , and an inner ring bushing 8 is installed inside the annular groove on the inner ring 3 .

[0023] In order to improve the dustproof performance on the outside, a first mounting groove is provided on the inner arc-shaped mounting surface of the outer ring 2 outside the annular groove, and a first dustproof ring 9 is mounted inside the first mounting groove.

[0024] In order to improve the dustproof property of the inner side, a second mounting groove is provided on the outer arc-shaped mounting surface of the inner ring 3 located inside the annular groove, and a second dustproof ring 10 is mounted inside the second mounting groove.

[0025] In order to improve the sealing performance, a main sealing ring 11 is arranged inside the rotary joint flange 1 between the connecting ends of the outer ring 2 and the inner ring 3 .

[0026] In order to facilitate installation and subsequent maintenance, cutouts are provided inside the outer ring bushing 7 and the inner ring bushing 8 for easy loading and unloading.

[0027] Principle: The steel ball 5 between the inner ring 3 and the outer ring 1 is limited by the screw plug 6. The inner ring liner 8 and the outer ring liner 7 are installed inside and outside the steel ball 5 respectively. With the protection of the liner, under the condition of large torque, the steel ball 5 will not directly squeeze the inner ring and the outer ring, causing the raceway to deform. Two dust rings are used between the inner ring and the outer ring to prevent impurities from entering. The outer ring 1 and the rotary joint flange 1 are connected by 8 screws M10×40, and the main sealing ring 11 is used in the middle to prevent leakage on the connection surface. The three steel ball raceways make the load distribution of the rotary joint uniform, and with the support of the liner, there will be no serious wear of a certain raceway, which will cause the steel ball to get stuck in the raceway, increase the friction, and make the crane pipe unable to operate.

[0028] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A three-track rotary joint, comprising a rotary joint flange (1), characterized in that: An outer ring (2) is fixedly mounted on the right side wall of the rotary joint flange (1) by screws, an inner ring (3) is movably inserted inside the outer ring (2), three mutually corresponding annular grooves are provided on the inner arc-shaped assembly surface of the outer ring (2) and the outer arc-shaped assembly surface of the inner ring (3), the annular grooves on the inner side surface of the outer ring (2) and the annular grooves on the outer side surface of the inner ring (3) are spliced ​​together to form three mutually parallel raceways (4), a steel ball (5) is arranged inside the raceway (4), an outer inner screw hole connected to the inside of the annular groove is provided inside the outer ring (2), and a screw plug (6) is installed inside the outer inner screw hole.

2. A three-track rotary joint according to claim 1, characterized in that: An outer ring bushing (7) is installed inside the annular groove on the outer ring (2), and an inner ring bushing (8) is installed inside the annular groove on the inner ring (3).

3. The three-track rotary joint according to claim 1, characterized in that: The inner arc-shaped assembly surface of the outer ring (2) is provided with a first installation groove outside the annular groove, and a first dustproof ring (9) is installed inside the first installation groove.

4. The three-track rotary joint according to claim 1, characterized in that: The outer arc-shaped assembly surface of the inner ring (3) is located inside the annular groove and is provided with a second installation groove, and a second dustproof ring (10) is installed inside the second installation groove.

5. The three-track rotary joint according to claim 1 is characterized in that: A main sealing ring (11) is arranged inside the rotary joint flange (1) between the connecting ends of the outer ring (2) and the inner ring (3).

6. The three-track rotary joint according to claim 2, characterized in that: The outer ring bushing (7) and the inner ring bushing (8) are both provided with cutouts for easy loading and unloading.

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